Bottas set the pace on the second morning of Formula One's opening pre-season test.
"This was the coldest weather I've ever driven in", said Mercedes's Valtteri Bottas. "So it is good to come here and switch on the vehicle and be able to run", Vettel said. Everything is making sense.
"It's very cold, the most important thing is that if you look at the table, we did almost 100 laps", he said. "But it's up to me if I perform on track and I will chose to show muscle if needed".
Belgian Stoffel Vandoorne took his McLaren-Renault to third fastest of the day, despite staying in the garage due to an overheating exhaust system.
However, Vandoorne's flier was registered on the hypersoft tyres, the quickest compound in Pirelli's 2018 portfolio, and on a three-lap run.
The setback leaves McLaren with the fewest completed laps of any team so far.
"It was very cold on track today". But the first impression of the RB14 is good, Verstappen said.
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Red Bull's fortunes turned after Daniel Ricciardo set the fastest time and clocked the most laps on Monday.
However, fuel and auto settings are unknown.
"Mileage is king in F1 testing, so we want to make the most of the current conditions", Mercedes says. "Of course Fernando (Alonso) is a good driver and maybe they have a better vehicle, but it's too early to say where the McLaren is and how strong they are looking".
"We still need better conditions to really unlock everything and really push the limits", he admitted. It's quite a hard approach to past year. He lost it at Turn One, while Sauber's Charles Leclerc and Haas' Kevin Magnussen also had spins. Considering that it was snowing also at the end of the day it's OK.
"I've learned a lot how to get the tyres to warm up", Bottas added.
The talks came as cold temperatures as low as 2-3 degrees made getting temperature into the tyres nearly impossible on Tuesday. "So, we were expecting to survive without cutting in the brake drums, but eventually we realized there was no chance, we needed to modify it to get some heat, and then it was fine".
Lewis Hamilton will take no part in testing for Mercedes on Tuesday following a surprise change to the team's schedule.
Hamilton could only muster the 25 laps on Monday in damp conditions where he was unable to test his current auto to its limits.
"In the morning, we focused on aero work with different aero rakes on the auto, running various tests". With no real understanding of whether good weather was coming or not, I took the decision to sacrifice that time in order for the team to gain better understanding of the auto.